He has represented farmers from Na Moku Aupuni o Ko'olau in their battle for a larger share of water diverted from Alexander & Baldwin's East Maui Irrigation Co. on Maui.

Haia has also represented recognized cultural descendants of iwi, or native Hawaiian remains, found at the site of the Wal-Mart store on Keeaumoku Street as well as General Growth's $150 million Ward Village Shops project in Kakaako -- site of what was to have been Whole Foods Market's first Hawaii store.